Power-drill.



" PATENTED JULY 23, 1907.

S. W. BOONB.

POWER DRILL.

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SAMUEL W. BOONE, OF ALMEDIA, PENNSYLVANIA.

POWER-DRILL.

Specification of Letters Patent.

Patented July 23, 1907.

Application filed April 25,1907. Serial No. 370,293.

To all whom it may concern;

Be it known that I, SAMUEL W. Boone, a citizen of the United States, residing at Almedia, in the county of Columbia and State of Pennsylvania, have invented certain new and useful Improvements in Power-Drills, of which the following is a specification, reference being had therein to the accompanying drawing.

My invention relates to improvements in power drills and similar hand tools of that class which employ small portable motors driven by steam or compressed air.

The object of the invention is to provide a tool of this character which will be simple, strong, durable, compact and inexpensive in construction and very convenient to manipulate. I

With the above and other objects in view, the invention consists in the novel construction, combination and arrangement of parts hereinafter described and claimed, and illustrated in the accompanying drawings, in which Figure 1 is a view illustrating the use of the invention as a portable mining drill; Fig. 2 is a longitudinal section through the motor or engine and the gearing connecting its shaft to the tool carrying spindle or shaft; Fig. 3 is a transverse section through the motor; Fig. 4 is an end elevation of the rotary piston of the motor; Fig. 5 is a perspective view of one of the self adjusting packing plates for the blades of the piston; and Fig. 6 is a detail view of a different form of gearing between the motor shaft and the tool spindle.

M'y improved portable power tool comprises a rotary engine or motor 1 adapted to be driven by steam, compressed air or other fluid under pressure. This motor comprises a cylinder 2 having its ends closed by plates or heads 3, 4, and containing a rotary piston 5 suitably secured to or formed upon a shaft 6. The latter is preferably eccentrically disposed with respect to the cylinder 2, as clearly shown in Fig. 3. The piston 5 is mounted upon anti-friction bearings consisting of two annular rows of bearing balls 7 arranged in race ways 8 formed in recesses in the opposite ends of the piston. Each series of the balls 7 is retained in its race way by two bearing rings 9, 10, the former of which is arranged in the bottom of the recess in one of the ends of the piston upon a circular boss formed on the bottom of said recess, and the latter of which is arranged upon a similar boss formed upon the inner face of one of the end plates or heads of the cylinder, as will be readily understood upon reference to Fig. 2. The piston 5 is of less diameter than the bore of the cylinder 2 and projecting radially from its periphery at suitable intervals are blades or vanes 11. In each of the blades 11 is formed a longitudinally extending slot or recess 12 for the reception of a self-adjusting packing plate or strip 13. The plates 13, as clearly shown in Figs. 2 and 5 have straight outer edges which are adapted to engage the inner surface of the cylinder 2 when the motor is in operation, and notched or recessed inner edges which conform to the shape of the seats 12. The plates 13 are equal in length to the piston, so that their ends will contact the opposing faces of the plates or heads 3, 4, but they are adapted to have a free radial sliding movement in the seats 12 so that they 'will be thrown outwardly by centrifugal force and also by pressure of the steam or compressed air which is admitted into the seats 12 behind said plates 13 through passages 12, as shown in Fig. 3. Steam or other fluid under pressure is admitted into the cylinder through an annularly disposed inlet port 14 arranged beneath an apertured plug or nipple 15 which is preferably screwed into a reinforcing plate 16 suitably secured upon the outer surface of the cylinder 2. The steam enters through the aperture in the nipple 15 and said aperture is preferably screw threaded for the ready application of a. threaded connection 17 upon the end of a flexible supply pipe or tube 18. As the steam enters the cylinder it is directed against the blades or vanes 11 so as to cause them to rotate it. After it has passed about half around the cylinder i1. exhausts through a discharge port 19.

Connected to the motor 1 is a casing 20 for a train of multiplying gears which connects the motor shaft 6 to the main driving shaft or tool spindle 2].. The casing 20 comprises two end plates 22, 23 between which is clamped an open frame 24 of rectangular or other suitable form. One end of the motor shaft 6 is extended through the plates 22, 23 and has keyed or otherwise socured upon it a pinion 25 which meshes with a gear 26 keyed or otherwise secured upon a sleeve or extended hub of a pinion 27. The hub or sleeve carrying the gears 26, 27 is loosely mounted upon a stub shaft 28 arranged in the plates 22, 23, as shown in Fig. 2. The pinion 27 meshes with a gear 29 fixed upon a sleeve 30 mounted for free rotary movement upon the extended end of the motor shaft 6 and also having fixed upon it a pinion 31 which meshes with a pinion or gear 32 keyed or otherwise fixed upon the tool spindle or shaft 21. The latter is mounted for rotation in a suitable bearing 33 upon the plate 22 and upon its outer end is a screw threaded head 34 for insertion in a threaded socket in a drill, or other tool. It will be understood that instead of the threaded head 34, I may employ any other suitable connection for attachment to the tool which is to be operated by the motor. At the inner end of the shaft 21 is arranged a thrust bearing 35 consisting of an annular row of bearing balls 36 arranged between bearing plates 37, 38 formed with opposing race ways. The plate 37 is formed by an integral annular flange on the shaft 21 and the plate 38 is in the form of an annular ring arranged upon a circular 'boss 23 formed upon the plate 23, as will be understood upon reference to Fig. 2.

The gear casing 20 and the motor 1 are preferably connected by a series of tie rods or bolts 39 which extend longitudinallypf the motor and easing upon the Outside of the cylinder 2 and the frame 24, and pass through apertnred cars 40 formedon the plates 22, 23,

3, 4. Nuts 41 are provided upon the threaded ends ofthe bolts 39 so that when said nuts are tightened the different parts of the motor and gear casing will be drawn together and held rigidly in position. This manner of connecting parts of the device enables them to be readily separated for repairing and cleaning purposes.

While the tool or device may be supported or suspended in any suitable manner, and while any suitable means may be provided for conveniently handling it, I preferably provide upon the outer plate or head 4 of the motor a threaded socket 42 for the reception of a suitable handle or when the tool is to be used as a'mining drill, for the reception of the threaded end 43 of a sleeve or tube 44 which is internally screw threaded at its opposite end for the reception of a feed screw 45. The latter is provided with a suitable cross bar or handle 46 for operating it and when in use its free end may be placed against any suitable support 47, as will be understood upon reference to Fig. 1.

In Fig. 6 of the drawings I have shown another form of gearing which may be substituted for the train of gears above described between the motor shaft 6 and the tool spindle 21. In said figure, 50 denotes a bevel gear secured to the shaft 6 and meshing with a similar gear 51 on a shaft 52 provided with a worm 53 which meshes with a worm gear 54 secured upon the shaft.21.

From the foregoing description taken in connection with the drawings it is thought that the construction, operation and advantages of the invention will be readily understood without a more extended description.

Having thus described my invention what I claim and desire to secure by Letters Patent is:

1. In a portable power tool of the character described, a motor casing consisting of a cylinder formed with inlet and outlet ports, end plates or heads secured uponthe opposite ends of the cylinder and formed with shaft bearings and inwardly projecting concentric bosses, a shaft arranged in said bearings. a rotary piston secured upon said shaft and having in its opposite ends concentric recesses formed upon their bottoms with outwardly projecting concentric bosses, the outer walls of said recesses being adapted to provide ball races, annular rows of bearing balls engaged with the latter, cone bearing rings engaged with said balls and arranged upon said bosses on the piston and the cylinder heads or plates, impact blades carried by said piston, a tool spindle and driving connections between said spindle and'the piston shaft.

2. In a portable power tool of the character described, a motor having a cylinder or casing, an eccentrically arranged shaft therein, a piston fixed upon'said shaft and having a'cylindrical body formed upon its periphery with transversely extending radially projecting blades, said blades being formed with longitudinally extending slots or recesses and with steam inlet ports opening into the bottoms of said slots or recesses, radially slidable packing plates or strips arranged in said slots of the blades and adapted -to be projected into engagement with the inner wall of the cylinder by the steam entering through said steam inlet ports, a tool spindle and driving connections between the latter and the shaft of the piston.

3. In a portable power tool of the character described,

a motor having a shaft, a gear casing having a plate at tached to said motor and formed with a boss. a tool spindle journaled in said gear casing and having at its inner end an annular flange formed with a ball race, a ring arranged upon said bossand formed with an opposing annular ball race, an annular series of bearing balls between said ring and said flange, and driving connections between said spindle and said shaft of the motor.

4. In a portable power tool of the character described, a motor having a casing consisting of a cylinder and end plates or heads, a gear casing consisting of end plates and an interposed inclosing frame or jacket and bolts or screws passed through the end plates of the motor and casing for uniting said parts. 7

In testimony whereof I hereunto afiix my signature in presence of two witnesses.

SAMUEL \V. BOONE.

Witnesses:

DANIEL MAUnY, GUY Jacomx. 

